E13 Unisex_Adult Helix Race-9-46T-11v Bike Cassettes, Grey/Silver, 11vNew to 2021, the HELIX Race cassette has more autonomy than any other cassette on the market. The 9-tooth sprocket allows the tray to be reduced by one size.Features of E13 Unisex_Adult Helix Race-9-46T-11v Bike Cassettes, Grey/Silver, 11v New in 2021, the HELIX Race cassette off..